Mulberry harbour

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View of the Mulberry B harbour "Port Winston" at Arromanches in September 1944

Mulberry harbours were temporary portable harbours developed by the British during World War II to facilitate the rapid offloading of cargo onto beaches during the Allied invasion of Normandy in June 1944. After successfully holding beachheads following D-Day two prefabricated harbours were taken in sections across the English Channel from Britain with the invading army and assembled off Omaha and Gold Beach.[1][2]

The Mulberry harbours were to be used until the Allies could capture a French port, initially thought to be around three months. However, it was not until six months after D-Day that the Belgian port of Antwerp was captured that use of the harbour at Gold Beach lessened. It was used for 10 months after D-Day and over 2.5 million men, 500,000 vehicles, and 4 million tonnes of supplies were landed using it before it was fully decommissioned. The Mulberry harbour at Omaha Beach had been severely damaged in a storm in late June 1944 and was abandoned.

There is conjecture about who actually came up with the idea, but the key plans for the design for the harbours were drawn by Welsh engineer Hugh Iorys Hughes.[3]


The Dieppe Raid of 1942 had shown that the Allies could not rely on being able to penetrate the Atlantic Wall to capture a port on the north French coast. The problem was that large ocean-going ships of the type needed to transport heavy and bulky cargoes and stores needed sufficient depth of water under their keels, together with dockside cranes, to off-load their cargo and this was not available except at the already heavily-defended French harbours. Thus, the Mulberries were created to provide the port facilities necessary to offload the thousands of men and vehicles, and tons of supplies necessary to sustain Operation Overlord and the Battle of Normandy. The harbours were made up of all the elements one would expect of any harbour: breakwater, piers, roadways etc.

Design and development

Aerial view of Mulberry harbour "B" (October 27, 1944)

An early idea for temporary harbours was sketched by Winston Churchill in a 1917 memo to Lloyd George. This memo was for artificial harbours to be created off the Dutch island of Borkum and the Danish island of Sylt. No further investigation was made and the memo was filed away.[4]

Winston Churchill issued his famous memo 'Piers for use on beaches' on 30 May 1942, apparently in some frustration at the lack of progress being made on finding a solution to the temporary harbour problem.[5] Between June 17 to August 6, 1942, Hugh Iorys Hughes submitted initial design concept for artificial harbours to the War Office[6]

At a meeting following the Dieppe Raid of 19 August 1942, Vice-Admiral John Hughes-Hallett (the naval commander for the Dieppe Raid) declared that if a port could not be captured, then one should be taken across the Channel. Hughes-Hallett had the support of Churchill. The concept of Mulberry harbours began to take shape when Hughes-Hallett moved to be Naval Chief of Staff to the Overlord planners.

In the autumn of 1942, the Chief of Combined Operations Vice-Admiral Lord Louis Montbatten, outlined the required for piers at least a mile long at which a continuous stream of supplies could be handled, including a pier head capable of handling 2,000-ton ships.


In 1943, three competing designs for the cargo-handling jetties was set up:

  • Hugh Iorys Hughes (a War Office engineer) who developed his "Hippo" piers and "Crocodile" bridge spans;
  • Ronald Hamilton (working at the Department of Miscellaneous Weapons Development) who devised the "Swiss Roll" which consisted of a floating roadway made of waterproofed canvas stiffened with slats and tensioned by cables;
  • William T Everall and Major Allan Beckett (of the War Office's 'Transportation 5 Department' (Tn5)) who suggested a floating bridge linked to a pier head (the latter had integral 'spud' legs that were raised and lowered with the tide).

Each of the designs was built and tested at Rigg Bay on the Solway Firth. The tests revealed various problems (the "Swiss Roll" would only take a maximum of a 7-ton truck in the Atlantic swell). However the final choice of design was determined by a storm during which the "Hippos" were undermined causing the "Crocodile" bridge spans to fail and the Swiss Roll was washed away. Tn5's design proved the most successful and Beckett's floating roadway (subsequently codenamed 'Whale') survived undamaged and the design was adopted and 10 mi (16 km) of Whale roadway were manufactured under the management of J. D. Bernal and Brigadier Bruce White, the Director of Ports and Inland Water Transport at the War Office.


With the planning of Operation Overlord at an advances stage by the summer of 1943 it was accepted that the proposed artificial harbours would need to be prefabricated on the UK and then towed across the English Channel.

The need for two separate artificial harbours - one American and one British/Canadian - was agreed at the Quebec Conference in August 1943. An Artificial Harbours Sub-Committee was set up under the Chairmanship of the civil engineer Colin R White (Sir Bruce White's brother) to advise on the location of the harbour and the form of the breakwater; the Sub-Committee's first meeting was held at the Institution of Civil Engineers (ICE) on 4 August 1943.[7] The minutes of the Sub-Committee's meetings show that initially it was envisaged that bubble breakwaters would be used, then block ships were proposed and finally, due to an insufficient number of block ships being available, a mix of block ships and purpose made concrete caisson units.

On 2 September 1943 the Combined Chiefs of Staff estimated that the artificial ports (Mulberries) would need to handle 12,000 tons per day, exclusive of motor transport and in all weathers. On 4 September the go ahead was given to start work immediately on the harbours. However, infighting between the War Office and the Admiralty over responsibility was only resolved on 15 December 1943 by the intervention of the Vice-Chiefs of Staff. The decision was that the Admiralty managed the blockships, Bombardons and assemble of all constituent parts on the south coast of England. Further the Admiralty would undertake all necessary work to survey, site, tow and mark navigation.

The War Office was given the task of constructing the concrete caisson (Phoenixes), the roadways (Whales) and protection via anti-aircraft installations. Once at the site, the army was responsible for sinking the caissons and assembling all the various other units of the harbours.

For the Mulberry A at Omaha Beach, the naval Corps of Civil Engineers would construct the harbour from the prefabricated parts.

The proposed harbours called for many huge caissons of various sorts to build breakwaters and piers and connecting structures to provide the roadways. The caissons were built at a number of locations, mainly existing ship building facilities or large beaches like Conwy Morfa around the British coast. The works were let out to commercial construction firms including Balfour Beatty, Henry Boot, Bovis & Co, Cochrane & Sons, Costain, Cubitts, French, Holloway Brothers, John Laing & Son, Peter Lind & Company, Sir Robert McAlpine, Melville Dundas & Whitson, Mowlem, Nuttall, Parkinson, Pauling & Co. and Taylor Woodrow.[8] On completion they were towed across the English Channel by tugs[9] to the Normandy coast at only 4.3 Knots (8 km/h or 5 mph), built, operated and maintained by the Corps of Royal Engineers, under the guidance of Reginald D. Gwyther, who was appointed CBE for his efforts.

Beach surveys

Both locations for the temporary harbours required detailed information concerning geology, hydrography and sea conditions. To collect this data a special team of hydrographers were created in October 1943. The 712th Survey Flotilla, based at HMS Tormentor at Warsash were detailed to collect soundings off the enemy coast. Between November 1943 and January 1944 this team used a LCP(L) (Landing Craft Personnel (Large)) to survey the Normandy coast.

The special LCP(L) was manned by a Royal Navy crew and a small group of hydrographers. The first sortie, Operation KJF, occurred On the night of November 26/27 when three LCPs took measurements off the port of Arromanches, the location for Mulberry B. A follow up mission, Operation KJG, to the proposed location for Mulberry A happened on December 1/2 but a navigation failure meant the team sounded an area 2,250 yards west of the correct area.

Two attempts had to made to take soundings off the Point de Ver. The first sortie, Operation Bellpush Able, on December 25/26 had issues with their equipment and returned on December 28/29 to complete the task.

On New Year's Eve 1943, a Combined Operations Pilotage Party (COPP), left Gosport for the Gold Beach area at Luc-sur-Mer. Two soldiers of the Royal Engineers, Major Scott-Bowden and Sgt. Ogden-Smith, were landed on the beach and took samples of the sand. These were crucial in determining whether the armoured vehicles would be able to operate on the beach or become bogged down. The final survey, Operation Bellpush Charlie, occurred on the night of January 30/31, but limited information was gathered due to fog and German lookouts heard the craft. Further sorties were abandoned.[10]


Wrecked pontoon causeway of one of the "Mulberry" artificial harbours, following the storm of 19–22 June 1944.

On the afternoon of 6 June 1944 (D-Day) over 400 towed component parts (weighing approximately 1.5 million tons) set sail to create the two Mulberry harbours. It included all the blockships (codenamed Corncobs) to create the outer breakwater (Gooseberries) and 146 concrete caissons (Phoenixes).

Arromanches Mulberry

At Arromanches, the first Phoenix was sunk at dawn on 9 June 1944 by 15 June a further 115 had been sunk to create a five-mile-long arc between Tracy-sur-Mer in the west to Asnelles in the east. To protect the new anchorage, the superstructures of the blockships (which remained above sea-level) and the concrete caissons were festooned with anti-aircraft guns and barrage balloons.

Omaha Mulberry

Arriving first. on D-Day itself were the Bombardons followed a day later by the first blockship. The first Phoenix was sunk on 9 June and the Gooseberry was finished by 11 June. By 18 June two piers and four pier heads were working. Though this harbour was abandoned in late June (see below), the beach continued to be used for landing vehicles and stores using Landing Ship Tanks (LSTs). Using this method, the Americans were able to unload a higher tonnage of supplies than at Arromanches. Salvageable parts of the artificial port were sent to Arromanches to repair the Mulberry there.[11]

The storm of 19 June 1944

Both harbours were almost fully functional when on 19 June a large north-east storm at Force 6 to 8 blew into Normandy and devastated the Mulberry harbour at Omaha Beach. The harbours had been designed with summer weather conditions in mind but this was the worst storm to hit the Normandy coast in 40 years.

The destruction at Omaha was so bad that the entire harbour was deemed irreparable. 21 of the 28 Phoenix caisson were completely destroyed and the Bombardons were cast adrift and the roadways and piers smashed.

At Arromanches, the Mulberry there was more protected, and although damaged it remained intact but damaged. This surviving Mulberry "B" came to be known as Port Winston. While the harbour at Omaha was destroyed sooner than expected, Port Winston saw heavy use for eight months, despite being designed to last only three months. In the 10 months after D-Day, it was used to land over 2.5 million men, 500,000 vehicles, and 4 million tonnes of supplies providing much needed reinforcements in France.[12] In response to this longer than planned use the Phoenix breakwater was reinforced with the addition of specially strengthened caisson.[13]

The Royal Engineers built a complete Mulberry Harbour out of 600,000 tons of concrete between 33 jetties, and had 10 mi (16 km) of floating roadways to land men and vehicles on the beach. Port Winston is commonly upheld as one of the best examples of military engineering. Its remains are still visible today from the beaches at Arromanches.

Harbour elements and code names

Below are listed brief details of the major elements of the harbours together with their associated military code names.


The remains of the harbour off Arromanches in 1990

Mulberry was the codename for all the various different structures that would create the artificial harbours. These were the "Gooseberries" which metamorphosed into fully fledged harbours. There were two harbours, Mulberry "A" and Mulberry "B". The "Mulberry" harbours consisted of a floating outer breakwater called "Bombardons", a static breakwater consisting of "Corncobs" and reinforced concrete caissons called "Phoenix", floating piers or roadways codenamed "Whales" and ""Beetles" and pier heads codenamed "Spuds". These harbours were both of a similar size to Dover harbour. In the planning of Operation Neptune the term Mulberry "B" was defined as, "An artificial harbour to be built in England and towed to the British beaches at Arromanches."[14]

Mulberry "A"

The Mulberry harbour assembled on Omaha Beach at Saint-Laurent-sur-Mer was for use by the American invasion forces. Mulberry "A" (American) was not securely anchored to the sea bed, resulting in such severe damage during the Channel storms of late June 1944 that it was considered to be irreparable and its further assembly ceased.[15] It was commanded by Augustus Dayton Clark.

Mulberry "B"

Mulberry "B" (British) was the harbour assembled on Gold Beach at Arromanches for use by the British and Canadian invasion forces. The harbour was unofficially named "Port Winston"[16] and was decommissioned six months after D-Day as allied forces were able to use the recently captured port of Antwerp to offload troops and supplies.


Corncobs and Gooseberries (block ships)

Corncobs were block ships that crossed the English Channel either under their own steam or that were towed and then scuttled to create sheltered water at the five landing beaches. Once in position the Corncobs created the sheltered waters known as Gooseberries.

The ships used for each beach were:

Two of the "Gooseberries" grew into "Mulberries", the artificial harbours.[20]"

Phoenix caissons

Phoenix construction, Weymouth 1944

Phoenixes were reinforced concrete caissons constructed by civil engineering contractors around the coast of Britain, collected and sunk at Dungeness and Pagham prior to D-Day. There were six different sizes of caisson (from approximately 2,000 tons to 6,000 tons each) and each unit was towed to Normandy by two tugs at around three knots. The caissons were initially sunk awaiting D-Day and then engineers refloated ("resurrected", hence the name) the Phoenixes and US Navy Captain (later Rear Admiral) Edward Ellsberg, already well known for quickly refloating scuttled ships at Massawa and Oran, was brought in to accomplish the task, though not without obtaining Churchill's intervention in taking the task away from the Royal Engineers and giving it to the Royal Navy. The Phoenixes, once refloated, were towed across the channel to form the "Mulberry" harbour breakwaters together with the "Gooseberry" block ships. Ellsberg rode one of the concrete caissons to Normandy; once there he helped unsnarl wrecked landing craft and vehicles on the beach.[21]

A pair of Phoenixes, and the remains of a third, at Arromanches


The bombardons were large 200 ft (61 m) by 25 ft (7.6 m) cross-shaped floating breakwaters fabricated in steel that were anchored outside the main breakwaters that consisted of Gooseberries (block ships) and Phoenixes (concrete caissons). 24 bombardon units, attached to one another with hemp ropes, would create a 1 mi (1.6 km) breakwater. During the storms at the end of June 1944 some bombardons sank while others broke loose, possibly causing more damage to the harbours than the storm itself. The design of the bombardons was the responsibility of the Royal Navy while the Royal Engineers were responsible for the design of the rest of the Mulberry harbour equipment.



A Whale floating roadway leading to a Spud pier at Mulberry A off Omaha Beach

The dock piers were code named Whales. These piers were the floating roadways that connected the "Spud" pier heads to the land. Designed by Allan Beckett the roadways were made from innovative torsionally flexible bridging units that had a span of 80 ft., mounted on pontoon units of either steel or concrete called "Beetles".[22] After the war many of the "Whale" bridge spans from Arromanches were used to repair bombed bridges in France, Belgium and the Netherlands. Such units are still visible as a bridge over the Meuse River in Vacherauville (Meuse), as a bridge over the Moselle River on road D56 between Cattenom and Kœnigsmacker (Moselle) and in Vierville-sur-Mer (Calvados) along road D517. A Whale span from Mulberry that was reused at Pont-Farcy was acquired by the Imperial War Museum and returned to England in July 2015; after conservation work the span is to feature as part of the Land Warfare exhibition at Imperial War Museum Duxford.


Beetles were pontoons that supported the Whale piers. They were moored in position using wires attached to "Kite" anchors which were also designed by Allan Beckett. These anchors had such high holding power that very few could be recovered at the end of the War. The Navy was dismissive of Beckett's claims for his anchor's holding ability so Kite anchors were not used for mooring the bombardons. The only known surviving Kite anchor is displayed in a private museum at Vierville-sur-Mer although a full size replica forms part of a memorial to Beckett in Arromanches.

Spud Piers

The pier heads or landing wharves at which ships were unloaded. Each of these consisted of a pontoon with four legs that rested on the sea bed to anchor the pontoon, yet allowed it to float up and down freely with the tide.

Surviving remnants in the UK

Littlestone-on-Sea Phoenix caisson

Sections of Phoenix caission can be found at:

German equivalent of Mulberry

In the period between postponement and cancellation of Operation Sea Lion, the invasion of the UK, Germany developed some prototype prefabricated jetties with a similar purpose in mind.[28] These could be seen in Alderney, until they were demolished in 1978.[28] The remaining foundations for the Alderney jetty formed an obstruction to the commercial quay extension project carried out in 2008-2009.

Daily Telegraph crosswords

"Mulberry" and the names of all the beaches were words appearing in the Daily Telegraph crossword puzzle in the month prior to the invasion. The crossword compilers, Melville Jones[29] and Leonard Dawe, were questioned by MI5 who determined the appearance of the words was innocent, but over sixty years later, a former student reported that Dawe frequently requested words from his students, many of whom were children in the same area as US military personnel.[30]


Some troops from the American Ghost Army went to Normandy two weeks after D-Day to simulate a fake Mulberry harbour. The deception was created in such a way that at night its lights drew German gunfire away from the real Mulberries.

See also


  1. "The Mulberry Harbours". United Kingdom Hydrographic Office. Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. "The story of the Mulberry harbours". D-Day Museum Arromanches. Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "D-Day: Hugh Iorys Hughes's Mulberry Harbour plans to be auctioned". BBC. 9 May 2014. Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Manchester, William; Reid, Paul (2012-11-06). The Last Lion: Winston Spencer Churchill: Defender of the Realm, 1940-1965 (Kindle Location 17843). Little, Brown and Company. Kindle Edition.
  5. "A User Requirement Document - Piers for Use on Beaches". Think Defence. Retrieved 12 September 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. "Hughes War Plans - Mulberry Harbours". Kaller Historical Documents. Retrieved 12 September 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. "War Office: Artificial Harbours" (PDF). Retrieved 13 September 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  8. Hartcup, p. 94
  9. Thames Tugs. Mulberry Harbour: British, French and Dutch tugs. Retrieved on 20 April 2009.
  10. Falconer, Jonathan (2013). D-Day 'Neptune', 'Overlord' and the Battle of Normandy. UK: Haynes. pp. 69–71. ISBN 978-0857332349.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  11. "Mulberry Harbours". Retrieved 21 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. "The Mulberry Harbour". Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  13. Hughes, Michael; Momber, Gary (2000). "The Mulberry Harbour Remains". In Allen, Michael J; Gardiner, Julie (eds.). Our Changing Coast a survey of the intertidal archaeology of Langstone Harbour Hampshire. York: Council for British Archaeology. pp. 127–128. ISBN 1-902771-14-1.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  14. "MULBERRY "B" D+4--D+147 1944 10 June to 31 October". SHAEF. Retrieved 20 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  15. "Omaha Beach Mulberry Harbor". Centre for Coastal and Ocean Mapping. 9 May 2014. Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  16. Robinson, Martin (22 March 2013). "'Port Winston' Mulberry harbour built off Normandy after D-Day is uncovered on the seabed 69 years later". Daily Mail. Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  17. 17.0 17.1 17.2 Morton, Jr, Wilbur D. The Journey Continues: The World War II Home Front. p. 111.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  18. Maritime Administration. "Illinoian". Ship History Database Vessel Status Card. U.S. Department of Transportation, Maritime Administration. Retrieved 26 December 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  19. "Gooseberry 2 (Omaha Beach)". Encyclopédie du débarquement et de la Bataille de Normandie. Retrieved 26 December 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  20. Churchill, Winston Spencer (1951). The Second World War: Closing the Ring. Houghton Mifflin Company, Boston. p. 642.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  21. Ellsberg, Edward (1960). The Far Shore. New York: Dodd, Mead.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  22. Some Aspects of the Design of Flexible Bridging Including 'Whale' Floating Roadways - A H Beckett
  23. "Mulberry Harbour Phoenix Caisson, Thorpe Bay, Southend-on-Sea". Retrieved 18 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  24. "World War II caisson, West Knock sandbank, Shoeburyness". Historic England. Retrieved 18 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  25. "Engineering feats that served our soldiers so well". Bognor Regis Observer. Retrieved 18 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  26. Sawer, Patrick (3 Jun 2014). "The concrete D-Day hulk that helped defeat Hitler". Daily Telegraph. Retrieved 18 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  27. "Mulberry Harbour construction site, Hayling Island". D-Day Museum. Retrieved 18 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  28. 28.0 28.1 Alderney at War. Brian Bonnard. 1993. ISBN 0-7509-0343-0. pp106–108. Alan Sutton Publishing Limited.
  29. "D-Day crosswords are still a few clues short of a solution". The Daily Telegraph. 6 February 2009. Retrieved 15 January 2011.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  30. "The Crossword Panic of 1944". Retrieved 2009-09-27.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>


Further reading

  • J. Evans, R. Walter, E. Palmer, (2000), A Harbour Goes to War: The Story of Mulberry and the Men Who Made It Happen'. Publisher - South Machars Historical Society, ISBN 1-873547-30-7
  • Stanford, Alfred B., (1951) Force Mulberry: The Planning and Installation of the Artificial Harbor of U.S. Normandy Beaches in World War II, New York: William Morrow & Co.
  • Institution of Civil Engineers, (1959), The Civil Engineer at War, vol 2. Docks and Harbours

External links

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